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N4392A saving arbitrary number of samples

Question asked by hudla on Mar 19, 2015
Latest reply on Mar 19, 2015 by olfu

I'm acquiring 28 GBd to 32 GBd QPSK and 16QAM optical signals using N4392A + 89600 VSA with OMA 4.1 optical extension. The sample rate of the device is 63 GSa/s and I can choose the number of samples per symbol (2 to 20). However, the system only allows saving traces of length of 4096 symbols. 

Is it possible to save longer traces? I believe the sample memory allows it (16000 samples), i.e., with 63 GSa/s, 28 GBd and 2 samples/symbol, one should be able to save up to 7111 symbols, not only 4096. 

Is it possible to save the raw ADC time trace (without interpolation) at 63 GS/s?

Thank you,